Question about Carrier 38BRC048 Air Conditioner

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Blower stays on

I have a intertherm model C3QA-054U-B. The blower stays on at a low speed all the time. If I put the thermostat on vent. the blower speeds up. If the a/c kicks in the blower speeds up. the only way I can make the blower stop is to turn the breaker off. Is there anything I can look at to check this out?

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  • steve
    steve May 11, 2010

    You have a faulty fan relay and or a bad capacitor.

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  • Master
  • 700 Answers

Yes whats is happenening is theres a sequencer on the unit thats closed all the time on the low speed

Posted on May 24, 2009

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1 Answer

Blower just started staying on - furnace has been turned of for 6 months


This is a diagram of a blower relay and a fan motor, the normally closed fan relay switch goes to the low speed which is the Heat speed, the low speed is controllled by a temperature delay depicted in the low speed circuit.
The normally open fan relay switch goes to the high speed, which is the AC modes speed , also if you run the fan continuously via the fan switch on the thermostat this is also to high speed.

I suspect the temperature delay's on setting is being reached thus cycling the low speed of the fan.



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1 Answer

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Some thermostats have a setting that keeps the fan running constantly. If its a programmable one you can change it. If it has a fan limit control it my be sticking.

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The air conditioner isnt blowing hard


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May 03, 2011 | 1997 Ford Contour

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My intertherm furnace (old model) has recently getting quite loud and clunky during its heating cycles, sound like the blower maybe??


Your blower motor has several speeds to it and by the problem you are having it sounds as though the blower motor may be going out. The motor has a slower speed for the heating cycle and since you have the noise in the heating mode I suggest having the blower motor changed as soon as possible since it could cause other problems in the heating section of the furnace( possibly burning out the high limit switches). Good Luck on your repairs hope this helped

Dave

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1 Answer

The furnace send signal to the fan in about 30 seconds, now this fan is set in auto from my termostat, my problem is the fan is starting slowly and some time it don't start, but if I use the option manual...


Depending on the model of the furnace, the blower is either a 2 or 3 speed. When the furnace operates in heating mode with the thermostat in the auto position, the furnace starts the fan when the furnace reaches a specific temperature or after a set time delay, but it operates the fan in low or med low speed on heat mode, when you put the thermostat fan switch in the "ON" position, the furnace operates the fan in "HI" speed, the same speed used for cooling mode. You may have a blower moter that is starting to short. I would recommend having a professional replace the motor before now before it becomes an emergency in the middle of the night during a cold spell.

Oct 10, 2009 | Heating & Cooling

1 Answer

I HAVE AN INTERTHERM FEB-017HAC-04 ELECTRIC FURNACE THAT IS PRODUCING HEAT,BUT THE FAN DOESN'T SEEM TO WANT TO KICK IN. THE BLOWER IS SET TO AUTO.


Probably a time delay relay fan switch not working.
Could be a bad low speed winding in the fan motor.
Set the wall T-stat for ON fan and see if it works.

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1 Answer

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yes you can as long as the temperature rise is whithin the proper range in heating on you unit data plate there should be the information the you need to have.

Jan 11, 2009 | Heating & Cooling

1 Answer

Blower speed


Yes usually the black is high speed, the blue is low and red medium speed. plug the black wire from the fan motor to where the blue wire is, then put the blue where the black wire was

Jan 10, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

What's the deal? Wont shut off or respond to thermostat. . .


Red= power........White=heat.............Green=fan.................(grey)-(yellow)=cool .....these are the connectons. Disconnect these wires from the thermostat and know that red/power is the only wire that send power to the thermostat, and the rest sends it back to the unit to call for whatever,, red--to . white for heat... red to green for fan .... &red to grey for cool! OK! Turn all your power on, and use a jumper wire from red / green for fan and see if the fan comes on! Then move the jumper wire from red to green , to red / to white for heat and the fan , wait for 3 minutes before removing and going to the next step. Then red /to grey for cool and check if the outside comes on. Either you have a wire touching past the insulations and making a connection, a bad thermostat ,oe excessive wire lead touching the next connection.Thank you very much!

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the blower on my furnace keeps going on and off when i turn the furnace on .ichanged the snapdiscs no change changed thermocoupler and therostat still no change whats my problem

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